(19)
(11) EP 0 565 371 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
13.04.1994 Bulletin 1994/15

(43) Date of publication A2:
13.10.1993 Bulletin 1993/41

(21) Application number: 93302761.7

(22) Date of filing: 07.04.1993
(51) International Patent Classification (IPC)5: C02F 1/20, C23F 11/00, C23F 11/14
(84) Designated Contracting States:
AT BE DE ES FR GB IT NL

(30) Priority: 08.04.1992 US 865419

(71) Applicant: BETZ EUROPE, INC.
Trevose, PA 19053-6783 (US)

(72) Inventors:
  • Boyette, Scott Martell
    Wilmington, Delaware 19805 (US)
  • Rossi, Anthony Michael
    Vincentown, New Jersey 08088 (US)

(74) Representative: W.P. Thompson & Co. 
Coopers Building, Church Street
Liverpool L1 3AB
Liverpool L1 3AB (GB)


(56) References cited: : 
   
       


    (54) Boiler double buffers


    (57) Methods of treating a steam generating system and inhibiting corrosion of metallic surfaces which comprises the step of adding to the aqueous phase of the system a non-oxygen containing alkylated diamine having at least two carbon atoms between the diamine nitrogen atoms.





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